Up until 4 months ago, I've been using Arnaud PushMail client. It's similar to the one you're talking about. It works well. I set up my home PC to check mail every minute, and forwards to my phone.
Here's a link to his project
http://www-rocq.inria.fr/who/Arnaud....ects/PushMail/
Here's where I originally found it on PDAPhoneHome.Com
http://pdaphonehome.com/forums/ppc-6...ghlight=arnaud
I know this works.. : )